APA (7th ed.) Citation

Calin, H., & Summers, L. (2010). What Need of Man? Project Gutenberg.

Chicago Style (17th ed.) Citation

Calin, Harold, and Leo Summers. What Need of Man? Project Gutenberg, 2010.

MLA (9th ed.) Citation

Calin, Harold, and Leo Summers. What Need of Man? Project Gutenberg, 2010.

Warning: These citations may not always be 100% accurate.